bash: aliases: add 're'
bash: theme: give some consistency to theme variables
bash: theme: also rename $prompt to $item_prompt
bash: theme: add a noop color

From <http://rtfm.etla.org/xterm/ctlseq.html> it appears that this code
is the most noop-ish of them all.
bash: theme: go one further, shorten $color_* to $fmt_*
bash: prompt: allow fmt_*_sfx to be specified
bash: aliases: add 're'
bash: ofb: remove redudant settings
Merge branch 'bash-prompt-cleanup'

Use more consistent variable names, allow overriding more things.